CN2507024Y - Multimode laser diode and monomode optical fiber coupler - Google Patents
Multimode laser diode and monomode optical fiber coupler Download PDFInfo
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- CN2507024Y CN2507024Y CN 01255006 CN01255006U CN2507024Y CN 2507024 Y CN2507024 Y CN 2507024Y CN 01255006 CN01255006 CN 01255006 CN 01255006 U CN01255006 U CN 01255006U CN 2507024 Y CN2507024 Y CN 2507024Y
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Abstract
A multimode laser diode and a monomode fiber coupler mainly comprise a collimating module integrated by two back and forth non-spherical cylindrical lens in a mutually orthometric way positioned on the same optic axis before laser diode luminous surface, automatic focusing lens of graded index and an input head of the fiber coupler. The image error of fast axis-directed laser beam being emitted by the laser diode is eliminated through the collimation of the front non-spherical cylindrical lens of the collimating module; the slow axis-directed laser beam being emitted forms image collimation through the collimation of the back non-spherical cylindrical lens of the collimating module to reduce beam spreading and source size. The laser beam output by the collimating module is output again into nearly symmetrical focalizing light spot size and divergence through automatic focusing lens, the laser beam of light size and divergence together with the laser beam matched with monomode fiber is irradiated into the input head of the fiber coupler. The utility model has comparatively high coupling efficiency and the total coupling efficiency is high to 70 percent compared with the prior art. The coupler has compact and reasonable structure, convenient operation and easy industrialization.
Description
Technical field:
The utility model is the coupler of a kind of multimode laser diode (LD) and single-mode fiber, particularly relates to the coupling of multimode laser diode (LD) Yu the single-mode fiber of wide light-emitting area (50～500 μ m) high power (1～8 watt of continuous wave output).
Background technology:
Many important application of laser diode (hereinafter to be referred as LD) are for example cut, welding, medical (type of focusing); Material processed, laser projection, demonstration, printing, photoetching (imaging mode) all require high power high luminance and be close to parallel low beam spreading, without aberration, intensity distribution evenly, the high quality beam of bundle shape symmetry, and wavelength is usually in λ≤980nm scope. Using for developing these, is a kind of good solution route with the output beam of single-mode fiber as the optics input of the collimation of rear optical system or imaging, focusing. Because the optical output power of the single mode LD of commercial nearly diffraction limit is excessively low, only limit to about 200mw, and the optical output power of the high-power LD of the another kind of wide surface of emission (50～500 μ m) is specially adapted to this application up to 1-8 watt. Such as, core diameter 9 μ m, digital aperture NAThe luminous power that the coupling output of the wide surface launching LD of=0.11 single-mode fiber and 780nm wavelength is 1 watt just can realize that average light power density is 13MW/cm2 Its optical power density is just than a typical high power neodymium-doped yttrium-aluminum garnet (Nd:YAG) laser instrument φ core=600 μ m, NAThe average light power density 1.1MW/cm of=0.2 coupling fiber output 3KW2Exceed more than 10 times. In addition, people also carry out incoherent or relevant superposition with the special optical system to the tail optical fiber output bundle of a lot of root single-mode fibers and wide LD coupling and reach and do not reduce in the power density situation seeking for, and increase substantially power output. Therefore, wide high-power LD and the efficient coupling of single-mode fiber have just become to have the prospect of application.
Usually the coupling of multimode LD and single-mode fiber, outstanding technical problem is that coupling efficiency is low. This be because: the beam spreading (nearly 90 ° of full-shapes) of the fast axle of laser beam (laterally) of (1) this LD height, and only about 10 ° of slow axis (side direction) beam spreadings, it is the mould field of ellipse and the circular symmetry mould field mismatch of single-mode fiber highly; (2) the lateral direction light emission face of LD very wide (50-500 μ m), the mould footpath of its mould footpath and single-mode fiber is less than the serious mismatch of φ 10 μ m; (3) because the bundle spot of the height ellipse of LD, fast axial strand corrugated is seriously crooked, and slow axis is near the axial pencil corrugated, the axial pencil corrugated mismatch of the asymmetric bending that Shu Bo practises physiognomy and single-mode fiber; (4) the decimal fractions aperture (N of the high beam spreading of the fast axle of LD and single-mode fiberA=0.11) mismatch. Formerly technology [1] is (referring to JOURNAL OF LIGHTWAVE TECHNOLOGY.Vol.8, No.9, September 1990.P1313～1318) adopt the cuneiform optical fiber end face, microtrabeculae face lens with the suitable radius that is made in the single-mode fiber end face, this correct-by-construction the mismatch of practising physiognomy, obtained the coupling to the 980nm wavelength wide light-emitting area LD of 30 μ m and single-mode fiber, coupling efficiency reaches 46%. Technology [2] (referring to S.D.DeMars, etal, CLEO ' 97, CMA2.P1～2) formerly, to adopt suitable burnt long number value aperture be NA=0.5 little excellent cylindrical lens collimation 980nm wavelength, wide the distributed feedback laser single mode of angle grating 300 μ m (the single spot of the nearly Gauss of its axis of LD far field, and slow axis is the nearly collimated light beam of 0.2 ° of beam spreading) laser beam be focused into the gradual index lens of 0.23 joint long (prtch) again and be mapped to single-mode fiber (φ core=7 μ m, NA=0.11), obtaining the tail optical fiber luminous power is 375mW, it and NALaser beam power 528mW light ratio behind=0.5 the little excellent cylindrical lens collimation is 71 ‰, is 85% depending on the collimation transmitance of little excellent cylindrical lens, then its total coupling efficiency η≤60%.
Summary of the invention:
The utility model provides the formerly more complete coupler of technology of a kind of ratio: the laser beam that collimates multimode LD with the integrated collimating module of two quadrature aspheric surface cylindrical lenses compositions, the fast axle laser beam of front aspheric surface cylindrical lens collimation LD of front in the collimating module, and bending with sizing practises physiognomy and becomes hither plane and practise physiognomy, and eliminates the aberration of collimatied beam. The rear aspheric surface cylindrical lens of back is collimated into the extended source laser beam of image width surface launching LD, dwindles beam spreading and Source size. Simultaneously, front and back two cylindrical lenses are eliminated the astigmatism of the fast axle of LD and slow axis, the laser beam of the nearly parallel nearly symmetry of aberration and astigmatism has been eliminated in acquisition, use again graded index (GRIN) GRIN Lens to be focused into and be mapped to single-mode fiber, finish efficient coupling, total coupling efficiency will be up to η=70%.
The concrete structure of the laser diode of multimode of the present utility model (LD) and single-mode optical-fibre coupler comprises the base 2 with shell electrode 1, the coupling main brace spare 3 that protruding tubular is arranged that is connected with base 2. Base 2 in coupling main brace spare 3 is equipped with semiconductor cooler 4. Be equipped with heat radiation copper billet 5 and the heat sink copper billet 17 that is connected at semiconductor cooler 4. Be equipped with thermistor 16 and light watch-dog 6 at heat radiation copper billet 5. Be equipped with the laser diode 7 that is centered close on base 2 and coupling main brace spare 3 central axis at heat sink copper billet 17. Nose place at coupling main brace spare 3 has ring flange 19 to be connected with the input connector 13 of single-mode fiber. The ceramic core 12 that single-mode fiber input connector 13 stretches out inserts in the liner collimation core retainer plate 11 of ring flange 19. Ceramic core 12 and coupling main brace spare 3 concentricity axis. In the endoporus at coupling main brace spare 3 nose places, facing to the light-emitting area of laser diode 7, be equipped with the collimating module 8 of central point on coupling main brace spare 3 central axis. Between the coupling fiber input head 10 of collimating module 8 and ceramic core 12 end faces, be equipped with GRIN Lens 9. Between collimating module 8 input end faces and laser diode 7 light-emitting areas, be equipped with coupling distance control piece 18. The optical axis of above-mentioned laser diode 7, collimating module 8, GRIN Lens 9 and coupling fiber input head 10 is same optical axis. As shown in Figure 1.
Said collimating module 8 is to consist of by the front aspheric surface cylindrical lens 801 of mutually orthogonal storing and rear aspheric surface cylindrical lens 802 are integrated. The input end face of collimating module 8 and output end face all are coated with the anti-reflection film to laser diode 7 wavelength of transmitted light. As shown in Figure 2. Facing to an end of laser diode 7 light-emitting areas, the input that namely is collimating module 8 is aspheric surface cylindrical lens 801 in the collimating module 8, and collimating module 8 outputs are rear aspheric surface cylindrical lens 802. The radius of curvature r of front aspheric surface cylindrical lens 801 is 0.04mm≤r≤0.1mm. The radius of curvature R of rear aspheric surface cylindrical lens 802 is 0.5mm≤R≤1.5mm. That is to say R＞r.
The refractive index of said GRIN Lens 9 is gradual changes. The long P of its jointtBe 0.23＜Pt≤ 0.25. As the long P of the joint of GRIN Lens 9t＞0.25 o'clock, coupling efficiency reduced. As the long P of jointt＜0.23 o'clock, the focal spot of light beam was greater than φ 10 μ m. The output end face of GRIN Lens 9 is the input end face of single-mode fiber. And GRIN Lens 9 input end faces and output end face all are coated with the anti-reflection film to the laser diode operation wavelength.
The light-emitting area of said laser diode 7 is controlled at 70 μ m≤d≤90 μ m to the coupling distance d between collimating module 8 input end faces. This coupling distance d is by placing the coupling distance control piece 18 between laser diode 7 light-emitting areas and collimating module 8 input end faces to control.
The inclined angle alpha of the optic fibre input end face of said coupling fiber input head 10 is 6 °＜α≤8 °.
As mentioned above, multimode LD of the present utility model and single-mode optical-fibre coupler, as shown in Figure 1 structure. The semiconductor cooler 4 that is equipped with on the base 2 of shell electrode 1 has the heat sink copper billet 17 of both all-in-one-pieces heat radiation copper billets 5 and LD7 on semiconductor cooler 4. Be equipped with the thermistor 16 of temperature-sensing element and the light watch-dog (PIN) 6 that the light leak mode is obtained photoelectric current at heat radiation copper billet 5. The coupling main brace spare 3 that is fixedly connected with by screw 15 with base 2 facing to the light-emitting area position of LD7 and LD7 with optical axis be equipped with one by two collimating modules 8 that mutually orthogonal aspheric surface cylindrical lens is integrated, between collimating module 8 and LD7 light-emitting area, be equipped with coupling distance control piece 18. Coupling main brace spare 3 collimates in the core retainer plate 11 with the input connector 13 of standard single-mode fiber and the liner of standard mounting flange 19 thereof, with LD7 and collimating module 8 with optical axis be equipped with (GRIN) GRIN Lens 9, the high-precision ceramic core 12 of the input connector of standard arranged, in ceramic core 12 with GRIN Lens 9 with optical axis be equipped with Single-Mode Fiber Coupling input head 10, thereafter connect stranding single-mode fiber transmission line 14, the tail optical fiber of transmission line 14 stretches out fiber-optic output face 21 for the output connecting head 22 of standard again.
Above the base 2 of said shell electrode 1, it can be standard TO-3 type shell seat, also can be isostructural other shell seat of class with higher heat dissipation capacity, concrete condition be decided on the refrigerator size of the required heat radiation power of the reliable and stable work of high-power LD.
Installation about base 2, semiconductor cooler 4, heat radiation copper billet 5 and heat sink copper billet 17 can be integrated. Semiconductor cooler 4 usefulness plumber's solder downhand weldings are in the center of the upper surface of base 2, again the smooth upper surface that is welded in semiconductor cooler 4 of heat radiation copper billet 5 usefulness plumber's solders. "+" word line has been drawn in center at heat radiation copper billet 5, again can be fixing with the screw location the heat sink copper billet 17 of LD7, on heat radiation copper billet 5, make "+" line center of the light-emitting area aligning heat radiation copper billet 5 of LD. So just form the integrated installation of base 2, refrigerator 4, heat radiation copper billet 5 and heat sink copper billet 17, set up the optical axis of LD, and its center can not moved the stability of LD Output optical power before keeping being coupled in time with variations in temperature.
Be connected and fixed screw 15 about base 2 and coupling main brace spare 3, except working the effect of being connected and fixed, the collimation that also has easily between LD7 and the collimating module 8 is proofreaied and correct positioning action, the standard of correction be the Laser output bundle that makes LD7 with optical axis drop on the center of collimating module 8 input end faces.
About coupling main brace spare 3, be used for location, centre of support collimating module 8, and consistent with the laser beam adjustment optical axis of LD7; Be used for being connected and fixed input connector 13 and the standard mounting flange 19 thereof of standard single-mode fiber by standard processing screw socket. Because it all is high-precision standard component that endoporus center precision height collimates ceramic core retainer plate 11 to the liner of the ceramic core 12 of the standard single-mode fiber of 1 μ m level input connector and mounting flange 19, this ring flange that is connected and fixed structure and two standard single-mode fiber connectors 13, a standard of 22 usefulness is connected and fixed the same, can guarantee to include optical element collimating module 8, concentricity, the optical axis of GRIN Lens 9 and Single-Mode Fiber Coupling input head 10 are consistent.
About collimating module 8, as shown in Figure 2 structure. Integrated by two mutually orthogonal front and back aspheric surface cylindrical lenses 801 and 802, all to operation wavelength plating anti-reflection film, the fast axle (θ of front aspheric surface cylindrical lens 801 collimation LD7⊥) beam spreading, it has optimized hyperboloid curvature, can eliminate the fast axial aberration of LD laser beam. Rear aspheric surface cylindrical lens 802 imaging collimate the beam spreading of the slow axis extended source of LD7, dwindle beam spreading and the source size of slow axis. Compensated the astigmatism of the collimatied beam of fast axle and slow axis with orthogonal set all-in-one-piece optical element before and after two aspheric surface cylindrical lenses of the present utility model. Bundle spot size behind the collimation is less than φ 1mm, and approaches symmetry, and the collimation transmitance is up to 90%.
About the GRIN Lens 9 of graded index,, all to operation wavelength plating anti-reflection film, its focal spot size and single-mode fiber mode spot are complementary biend, and focus point drops on the output end face place.
About coupling fiber input head 10, be fixed on by standard technology in the endoporus of the ceramic core 12 of inputting connector 13, couple input face grinding and polishing becomes 6 °～8 ° inclination angles, to reduce the reflection loss from the LD7 incident light, improves coupling efficiency. The coupling efficiency of light beam power is up to 78% behind the utility model collimation module 8 collimation, to total coupling efficiency of the LD7 Emission Lasers beam power of wide surface launching up to 70 %.
The beneficial effects of the utility model are significant.
The utility model has solved formerly, and technology [1] [2] all can not solve the LD of wide surface launching and the difficult problem of single-mode fiber efficient coupling technology. Fast axle (the θ of LD7 in the utility model⊥) the direction laser beam is through the collimation of the front aspheric surface cylindrical lens 801 of collimating module 8 front ends, eliminated aberration; LD7 slow axis (θ∥) the imaging collimation of laser beam aspheric surface cylindrical lens 802 behind collimating module 8 rear end faces of direction, dwindle its beam spreading and source size. Since lens 801 and 802 combined compensation the astigmatism of fast axle and slow axis beam, make laser beam behind the collimation have fast and slow axis all near plane wave and obtain simultaneously with a tight waist, spot size all＜φ 1mm, be coupled into by high efficiency by the laser beam of collimating module 8 outputs and be mapped to GRIN Lens 9. Self-focusing through the radially parabola shaped graded index of GRIN Lens 9, export nearly symmetric focused laser beam, its focus is pressed close to the output end face of GRIN Lens, its mould field spot size and divergence all are complementary with the single-mode fiber mode field, and symmetrical its beam divergence of the nearly uniformly circle of single-mode fiber output intensity is the high brightness planar laser beam of 12.6 ° (full-shapes). So the coupling efficiency of the wide surface launching LD of the utility model coupler and single-mode fiber than technology [1] formerly 46% and formerly technology [2] 60% bring up to 70%. In addition, coupler of the present utility model also is applicable to the coupling of fillet high power single mode LD and single-mode fiber, so the application potential of the utility model coupler is very large.
The coupled structure compact and reasonable of the utility model coupler, small portable, all to use standard single- mode fiber connector 13,22 again, mounting flange and the transmission of standard stranding single-mode fiber, good, the high conformity of same optical axis degree of coupling element when integrated, the adjusting operation that is coupled and aligned is convenient, and is firm solid, and dismounting easily. So the utility model coupler possesses the advantage of the industrialization of being easy to.
The said collimating module 8 of the utility model, quadrature together before and after adopting two aspheric surface cylindrical lenses, its spacing distance is suitable for the astigmatism compensated distance coupling of the fast axle of LD7 and slow axis, has eliminated the astigmatism of the collimated light of wide surface launching LD, and this is conducive to improve the coupling efficiency with single-mode fiber.
The said collimating module 8 of the utility model adopts the front aspheric surface cylindrical lens 801 of hyperboloid the best to collimate the fast axle (θ of wide LD7⊥) laser beam highly dispersed, make its serious crooked corrugated be corrected into ideally plane wave, eliminated aberration. Proofread and correct the effective of corrugated than common cylindrical lens, this has also improved the coupling efficiency with single-mode fiber.
The said collimating module 8 of the utility model, aspheric surface cylindrical lens 802 is collimated into the laser beam of low beam spreading (～10 °) extended source (50～500 μ m) of slow axis of image width surface launching LD7 after adopting, dwindle its beam spreading and bundle spot size, this effective collimation to wide surface launching LD7 is coupled into and is mapped to single-mode fiber is obligato.
The said graded index GRIN Lens 9 of the utility model, it saves long PtBe 0.23＜Pt≤ 0.25 compares with technology formerly, focus point is arranged just in the advantage of being close to the output end face place. Coupling fiber input head input needs only the output end face of being close to GRIN Lens with optical axis ground, just finishes being coupled and aligned of single-mode fiber and collimated laser beam.
The couple input face grinding and polishing of the said coupling fiber input head 10 of the utility model becomes ° inclination angle, 6 °＜α≤8, and 6 of technology ° of inclination angles formerly have the advantage of easy processing on year-on-year basis.
Coupler of the present utility model, built-in semiconductor cooler, thermistor and light watch-dog have the function of refrigeration temperature control control power, can keep the reliable and stable work of wide high-power LD. And can add suitable fin at the bottom surface of base 2 easily according to Output optical power and the heat radiation requirement of wide high-power LD.
Description of drawings:
Fig. 1 is the overall structure schematic diagram of the utility model coupler.
Fig. 2 is the structural representation of collimating module 8 in the utility model coupler.
The specific embodiment:
Such as the structure of Fig. 1, Fig. 2, the performance parameter of the single-mode fiber of preferred embodiment of the present utility model and multimode LD7, collimating module 8, GRIN Lens 9 and coupler as shown in the following chart.
| Example 1 | Example 2 | |
| The single-mode fiber feature | Standard molten silicon step-index single-mode fiber; NA＝0.11，φ
Core＝9μm，φ
Covering=125 μ m, the tight stranding φ=3.0mm of length 1.5m standard, for FC standard connector as input and | |
| Wide LD feature of | Embodiment | 1 for laser diode 7 (LD) light-emitting area of 1W continuous wave output is: 100 μ m * 1 μ m. Light beam emissions degree θ⊥×θ ∥＜80°× 12°(FW 1/e z) wavelength X=800nm | Embodiment 2 for laser diode 7 (LD) light-emitting area of 2W continuous wave output is: 200 μ m * 1 μ m luminous exitance θ⊥×θ ∥＜80°× 12°(FW 1/e z) wavelength X=800nm |
| Collimating module 8 parameters | Operation wavelength λ to above-mentioned LD: 800nm material: aspheric surface cylindrical lens 801 burnt long F/L=0.13mm before the molten silicon, aspheric surface cylindrical lens 802 burnt long F/L=2.2mm behind the r=0.06mm, the R=1mm size (L * W * J): 2mm * 2mm * 3mm input end face and output end face are all to operation wavelength λ=800nm plating anti-reflection film collimation transmitance: T=88% (embodiment 1), T=87% (embodiment 2) | ||
| The GRIN Lens feature | Operation wavelength λ: 780nm-830nm diameter phi=2mm length L=5mm saves long Pt=0.25mm input and output both ends of the surface are plated anti-reflection film to operation wavelength λ=800nm | ||
| Coupler performance | 79% pair wide LD laser beam coupling efficiency of light beam power coupling efficiency, 69.5% tail optical fiber Output optical power P after the collimationCW12.6 ° of=695mw beam divergence angles, light intensity unevenness 5% | 78% pair wide LD laser beam coupling efficiency of light beam power coupling efficiency, 67.9% tail optical fiber Output optical power P after the collimationCW12.6 ° of=1.35W beam divergences, light intensity unevenness～5% | |
Claims (6)
1. a multimode laser diode and single-mode optical-fibre coupler, comprise the base 2 with shell electrode (1), be connected with the coupling main brace spare (3) of protruding tubular with base (2), base (2) in coupling main brace spare (3) is equipped with semiconductor cooler (4), be equipped with heat radiation copper billet (5) and the heat sink copper billet (17) that is connected at semiconductor cooler (4), be equipped with thermistor (16) and light watch-dog (6) at heat radiation copper billet (5), be equipped with the laser diode (7) that is centered close on base (2) and coupling main brace spare (3) central axis at heat sink copper billet (17), nose place at coupling main brace spare (3) has ring flange (19) to be connected with the input connector (13) of single-mode fiber, the ceramic core (12) that input connector (13) stretches out inserts in the liner collimation core retainer plate (11) of ring flange (19), ceramic core (12) and the concentricity axis of coupling main brace spare (3), it is characterized in that the light-emitting area facing to laser diode (7), in the endoporus at coupling main brace spare (3) nose place, central point is equipped with collimating module (8) at the central axis of coupling main brace spare (3), between the coupling fiber input head (10) of collimating module (8) and ceramic core (12) end face, be equipped with GRIN Lens (9), between collimating module (8) and laser diode (7), be equipped with coupling distance control piece (18), above-mentioned laser diode (7), collimating module (8), the optical axis of GRIN Lens (9) and coupling fiber input head (10) is same optical axis.
2. multimode laser diode according to claim 1 and single-mode optical-fibre coupler, it is characterized in that said collimating module (8) is that input end face and output end face all are coated with the anti-reflection film to operation wavelength by the front aspheric surface cylindrical lens (801) of mutually orthogonal storing and the integrated formation of rear aspheric surface cylindrical lens (802).
3. multimode laser diode according to claim 1 and 2 and single-mode optical-fibre coupler is characterized in that the radius of curvature r of mutually orthogonal integrated front aspheric surface cylindrical lens (801) in the said collimating module (8) is 0.04mm＜r＜0.1mm; The radius of curvature R of rear aspheric surface cylindrical lens (802) is 0.5mm＜R＜1.5mm.
4. multimode laser diode according to claim 1 and single-mode optical-fibre coupler is characterized in that the refractive index of said GRIN Lens (9) is gradual change, the long P of its jointtBe 0.23＜Pt≤ 0.25, the input and output end face all is coated with the anti-reflection film to operation wavelength.
5. multimode laser diode according to claim 1 and single-mode optical-fibre coupler, the inclined angle alpha that it is characterized in that the optic fibre input end face of said coupling fiber input head (10) are 6 °＜α≤8 °.
6. multimode laser diode according to claim 1 and single-mode optical-fibre coupler, the light-emitting area that it is characterized in that said laser diode (7) are controlled at 70 μ m≤d≤90 μ m to the coupling distance d between the input end face of collimating module (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01255006 CN2507024Y (en) | 2001-11-30 | 2001-11-30 | Multimode laser diode and monomode optical fiber coupler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01255006 CN2507024Y (en) | 2001-11-30 | 2001-11-30 | Multimode laser diode and monomode optical fiber coupler |
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| Publication Number | Publication Date |
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| CN2507024Y true CN2507024Y (en) | 2002-08-21 |
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| CN 01255006 Expired - Fee Related CN2507024Y (en) | 2001-11-30 | 2001-11-30 | Multimode laser diode and monomode optical fiber coupler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749715A (en) * | 2013-12-30 | 2015-07-01 | 福州高意通讯有限公司 | Single-mode optical fiber coupling structure of multi-transverse mode laser |
| CN109975985A (en) * | 2017-12-27 | 2019-07-05 | 宁波舜宇车载光学技术有限公司 | Light-beam forming unit and shaping methods |
-
2001
- 2001-11-30 CN CN 01255006 patent/CN2507024Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749715A (en) * | 2013-12-30 | 2015-07-01 | 福州高意通讯有限公司 | Single-mode optical fiber coupling structure of multi-transverse mode laser |
| CN109975985A (en) * | 2017-12-27 | 2019-07-05 | 宁波舜宇车载光学技术有限公司 | Light-beam forming unit and shaping methods |
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